Electrolytic capacitor deposit electric quantity release circuit and charger

Abstract

The utility model discloses an electrolytic capacitor deposit electric quantity release circuit and a charger, and belongs to the technical field of chargers. Comprising an electrolytic capacitor, a rectifier diode, a filter capacitor, a voltage division circuit and a bleeder control circuit, the bleeder control circuit comprises a first field effect transistor, a second field effect transistor, a first bleeder resistor, a second bleeder resistor and a third bleeder resistor which are connected in series, and a fourth bleeder resistor and a fifth bleeder resistor which are connected in series; the grid electrode of the first field effect transistor is electrically connected with the voltage division circuit, the source electrode of the first field effect transistor is electrically connected with the first end of the first bleeder resistor and the source electrode of the second field effect transistor, and the drain electrode of the first field effect transistor is electrically connected with the second end of the first bleeder resistor and the source electrode of the second field effect transistor; and the third bleeder resistor and the fifth bleeder resistor are electrically connected with the electrolytic capacitor. The storage electric quantity of the capacitor can be quickly released without increasing the standby power consumption of the charger, and the problems of slow electric quantity release and high standby power consumption of the electrolytic capacitor are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of chargers, in particular to an electrolytic capacitor stored electricity release circuit and a charger. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] When a traditional charger is charging a battery, a certain amount of electricity is stored in the electrolytic capacitor. When the charger is disconnected from the input power, the electricity stored in the electrolytic capacitor is released, causing the battery pack charging indicator light to stay on, creating the false impression that the battery is still charging.

[0004] In the prior art, the voltage across the electrolytic capacitor is discharged by adding a discharge resistor at both ends of the electrolytic capacitor. However, if the discharge resistor is simply added, although it solves the problem of the charging indicator light being falsely lit, if the resistance of the discharge resistor is too small, the standby power consumption of the charger will increase accordingly. If the resistance of the discharge resistor is too large, the discharge will be too slow. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of the embodiments of the utility model is to provide an electrolytic capacitor stored charge release circuit and a charger, which fully utilizes the working principle of the MOS tube and is matched with a discharge resistor. After the input power is disconnected, the capacitor stored charge can be quickly released without causing the battery pack charging indicator light to light up and without increasing the standby power consumption of the charger.

[0006] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0007] An electrolytic capacitor stored electricity release circuit, comprising an electrolytic capacitor, a rectifier diode, a filter capacitor, a voltage divider circuit and a discharge control circuit;

[0008] The anode of the rectifier diode is electrically connected to the first end of the voltage divider circuit, the second end of the voltage divider circuit is electrically connected to the first end of the filter capacitor, the second end of the filter capacitor is electrically connected to the electrolytic capacitor, and the voltage divider circuit is electrically connected to the discharge control circuit;

[0009] Among them, the discharge control circuit includes a first field effect transistor, a second field effect transistor, a first discharge resistor, a second discharge resistor and a third discharge resistor connected in series, and a fourth discharge resistor and a fifth discharge resistor connected in series; the gate of the first field effect transistor is electrically connected to the voltage divider circuit, the source of the first field effect transistor is electrically connected to the first end of the first discharge resistor and the source of the second field effect transistor respectively, and the drain of the first field effect transistor is electrically connected to the second end of the first discharge resistor and the source of the second field effect transistor respectively; the third discharge resistor and the fifth discharge resistor are electrically connected to the electrolytic capacitor.

[0010] The embodiment of the utility model further provides a charger, comprising the above-mentioned electrolytic capacitor stored electricity release circuit.

[0011] The technical solution provided by the utility model has at least the following technical effects or advantages:

[0012] The technical solution provided by the utility model utilizes a diode and a small-capacity capacitor to detect whether a voltage is input, utilizes two MOS tubes and corresponding resistors of different resistance values ​​to discharge the electrolytic capacitor, and when there is an input voltage at the AC end, the electrolytic capacitor is connected to the large-resistance resistor to reduce no-load power consumption; when the input voltage at the AC end is turned off, a small-resistance discharge resistor is used to quickly discharge the voltage at both ends of the electrolytic capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0014] Figure 1 It is a circuit diagram of an electrolytic capacitor stored electricity release circuit provided by an embodiment of the utility model;

[0015] Figure 2 It is a circuit diagram of a charger provided by an embodiment of the utility model;

[0016] In the figure: 1. Bridge rectifier circuit; 2. Discharge control circuit; 3. Power supply circuit.

[0017] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0018] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0019] Embodiment 1

[0020] The charger includes a bridge rectifier circuit 1 and an electrolytic capacitor C6. When there is input voltage at the power input end, the bridge rectifier circuit 1 is used for rectification and the input electrolytic capacitor C6 is used for filtering. At this time, the electrolytic capacitor C6 is fully charged and has a high voltage at both ends. If the input voltage at the power input end is turned off and a discharge circuit is not added, the electrolytic capacitor C6 stores a certain amount of energy, causing the indicator light at the output end of the power tool battery pack to light up for a long time, which may make the user mistakenly believe that the battery pack is still charging.

[0021] The bridge rectifier circuit 1 includes an adjustable resistor VR1, a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C4, a rectifier bridge BD1, and a first resistor R1 and a second resistor R2 connected in series; the adjustable resistor VR1, the first capacitor C1, the second capacitor C4, the rectifier bridge BD1, and the first resistor R1 and the second resistor R2 connected in series are connected in parallel with a power supply, a first end of the first inductor L1 is electrically connected to a first end of the adjustable resistor VR1, a second end of the first inductor L1 is electrically connected to a second end of the adjustable resistor VR1, a third end of the first inductor L1 is electrically connected to a first end of the first resistor R1, and a fourth end of the first inductor L1 is electrically connected to a second end of the second resistor R2; a first end of the second inductor L2 is electrically connected to a first end of the first capacitor C1, a second end of the second inductor L2 is electrically connected to a first end of the second capacitor C2, a third end of the second inductor L2 is electrically connected to a second end of the first capacitor C1, and a fourth end of the second inductor L2 is electrically connected to a second end of the second capacitor C2.

[0022] As introduced in the background technology, the electrolytic capacitor stored electricity release method in the prior art will increase the standby power consumption of the charger or make the electricity discharge speed too slow. In order to solve the above technical problems, the utility model proposes an electrolytic capacitor stored electricity release circuit.

[0023] Combination Figure 1-Figure 2 The electrolytic capacitor stored electricity release circuit includes an electrolytic capacitor C6, a rectifier diode D30, a filter capacitor C100, a voltage divider circuit and a discharge control circuit 2. The discharge control circuit 2 includes a first field effect transistor Q10-1, a second field effect transistor Q11, a first discharge resistor R123, a second discharge resistor R125 and a third discharge resistor R124 connected in series, and a fourth discharge resistor R127 and a fifth discharge resistor R126 connected in series. The voltage divider circuit includes a first voltage divider resistor R120, a second voltage divider resistor R121 and a third voltage divider resistor R122.

[0024] Specifically, the cathode of the rectifier diode D30 is electrically connected to the AC neutral line of the input power supply, the anode of the rectifier diode D30 is electrically connected to the first end of the first voltage-dividing resistor R120, the second end of the first voltage-dividing resistor R120 is electrically connected to the first end of the second voltage-dividing resistor R121, the second end of the second voltage-dividing resistor R121 is electrically connected to the first end of the third voltage-dividing resistor R122, and the second end of the third voltage-dividing resistor R122 is grounded; the second end of the first voltage-dividing resistor R120 is electrically connected to the first end of the filter capacitor C100, and the second end of the filter capacitor C100 is electrically connected to the negative electrode of the electrolytic capacitor C6.

[0025] The first end of the third voltage-dividing resistor R122 is electrically connected to the gate of the first field effect transistor Q10-1, the first end of the third voltage-dividing resistor R122 is electrically connected to the source of the first field effect transistor Q10-1, the positive electrode of the electrolytic capacitor C6 is electrically connected to the first end of the third discharge resistor R124, the second end of the third discharge resistor R124 is electrically connected to the first end of the second discharge resistor R125, the second end of the second discharge resistor R125 is electrically connected to the first end of the first discharge resistor R123, the first end of the first discharge resistor R123 is electrically connected to the drain of the first field effect transistor Q10-1, and the second end of the first discharge resistor R123 is electrically connected to the source of the first field effect transistor Q10-1.

[0026] The first discharge branch of the electrolytic capacitor C6 is formed by the first field effect transistor Q10-1, the first discharge resistor R123, the second discharge resistor R125 and the third discharge resistor R124. The first discharge resistor R123, the second discharge resistor R125 and the third discharge resistor R124 have relatively large resistance values ​​to avoid large power consumption when the charger is unloaded.

[0027] In order to quickly discharge the stored electricity in the electrolytic capacitor C6 when the AC input voltage is turned off, the gate of the second field effect transistor Q11 is electrically connected to the first end of the first discharge resistor R123, the source of the second field effect transistor Q11 is electrically connected to the source of the first field effect transistor Q10-1, the drain of the second field effect transistor Q11 is electrically connected to the first end of the fourth discharge resistor R127, the second end of the fourth discharge resistor R127 is electrically connected to the first end of the fifth discharge resistor R126, and the second end of the fifth discharge resistor R126 is electrically connected to the positive electrode of the electrolytic capacitor C6.

[0028] The working method of this embodiment is as follows:

[0029] When there is input voltage at the input power supply end, it is rectified by the rectifier diode D30 and filtered by the filter capacitor C100, and then divided by the three voltage-dividing resistors R120, R121 and R122. When the input voltage at the input power supply end rises to the level that can turn on the first field effect transistor Q10-1, the first field effect transistor Q10-1 is turned on. At this time, R124, R12 and R123 are discharge resistors with relatively large resistance values, which have little effect on no-load power consumption.

[0030] When the input voltage at the input power supply end is turned off, since the capacity of the filter capacitor C100 is small, it can be discharged quickly. The gate voltage of the first field effect tube Q10-1 is not enough to maintain conduction, Q10-1 is cut off, and the voltage of the electrolytic capacitor C6 continues to be maintained due to its large capacity. R124, R125 and R123 generate a bias voltage, so that the second field effect tube Q11 is turned on. At this time, R126 and R127 act as discharge resistors of the electrolytic capacitor C6. Since the resistance of R126 and R127 is small, the voltage across the capacitor C6 can be discharged quickly.

[0031] As an implementation mode, in order to improve the safety and stability of the circuit, the third voltage-dividing resistor R122 is connected in parallel with a voltage-stabilizing diode ZD10 and a capacitor C150, and the first discharge resistor R123 is connected in parallel with a voltage-stabilizing diode ZD11.

[0032] Embodiment 2

[0033] like Figure 2 As shown, based on the above-mentioned electrolytic capacitor stored power release circuit, this embodiment also provides a charger, which is provided with the electrolytic capacitor stored power release circuit described in the above-mentioned embodiment, a bridge rectifier circuit 1 for rectifying the input power supply, an electrolytic capacitor for filtering the input power supply and a power supply circuit 3 for power supply. The input power supply is supplied to the outside through the power supply circuit 3 after rectification and filtering.

[0034] The electrolytic capacitor storage charge release circuit is electrically connected to the electrolytic capacitor in the charger circuit. The specific circuit connection relationship is the same as that in the first embodiment and will not be repeated here. The bridge rectifier circuit 1 and the power supply circuit 3 are common circuits in the prior art. The specific circuit composition and connection relationship are as follows: Figure 2 As shown, no further description is given here.

[0035] Since the above-mentioned electrolytic capacitor stored electricity release circuit has the above-mentioned technical effects, please refer to the above-mentioned embodiments for the technical effects of the charger using the electrolytic capacitor stored electricity release circuit.

[0036] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. An electrolytic capacitor stored electricity release circuit, characterized in that: It includes an electrolytic capacitor, a rectifier diode, a filter capacitor, a voltage divider circuit and a discharge control circuit; The anode of the rectifier diode is electrically connected to the first end of the voltage divider circuit, the second end of the voltage divider circuit is electrically connected to the first end of the filter capacitor, the second end of the filter capacitor is electrically connected to the electrolytic capacitor, and the voltage divider circuit is electrically connected to the discharge control circuit; Among them, the discharge control circuit includes a first field effect transistor, a second field effect transistor, a first discharge resistor, a second discharge resistor and a third discharge resistor connected in series, and a fourth discharge resistor and a fifth discharge resistor connected in series; the gate of the first field effect transistor is electrically connected to the voltage divider circuit, the source of the first field effect transistor is electrically connected to the first end of the first discharge resistor and the source of the second field effect transistor respectively, and the drain of the first field effect transistor is electrically connected to the second end of the first discharge resistor and the source of the second field effect transistor respectively; the third discharge resistor and the fifth discharge resistor are electrically connected to the electrolytic capacitor.

2. The electrolytic capacitor stored electricity release circuit according to claim 1, characterized in that: The voltage-dividing circuit comprises a first voltage-dividing resistor, a second voltage-dividing resistor and a third voltage-dividing resistor, the anode of the rectifier diode is electrically connected to the first end of the first voltage-dividing resistor, the second end of the first voltage-dividing resistor is electrically connected to the first end of the second voltage-dividing resistor, the second end of the second voltage-dividing resistor is electrically connected to the first end of the third voltage-dividing resistor, and the second end of the third voltage-dividing resistor is grounded; The second end of the first voltage-dividing resistor is electrically connected to the filter capacitor, and the first end of the third voltage-dividing resistor is electrically connected to the source of the first field effect transistor.

3. The electrolytic capacitor stored electricity release circuit as claimed in claim 2, characterized in that: The third voltage-dividing resistor is connected in parallel with a voltage-stabilizing diode and a capacitor.

4. The electrolytic capacitor stored electricity release circuit according to claim 1, characterized in that: The first discharge resistor is connected in parallel with a voltage regulator diode.

5. The electrolytic capacitor stored electricity release circuit as claimed in claim 1, characterized in that: The resistance value of the first discharge resistor is greater than the resistance value of the fourth discharge resistor.

6. The electrolytic capacitor stored electricity release circuit as claimed in claim 1, characterized in that: The first field effect transistor and the second field effect transistor are N-type MOS transistors.

7. The electrolytic capacitor stored electricity release circuit according to claim 1, characterized in that: The cathode of the rectifier diode is connected to the AC zero line of the power supply.

8. The electrolytic capacitor stored electricity release circuit as claimed in claim 1, characterized in that: It also includes a bridge rectifier circuit, the power supply is electrically connected to the bridge rectifier circuit, and the bridge rectifier circuit is electrically connected to the electrolytic capacitor.

9. The electrolytic capacitor stored electricity release circuit as claimed in claim 8, characterized in that: The bridge rectifier circuit comprises an adjustable resistor, a first inductor, a second inductor, a first capacitor, a second capacitor, a rectifier bridge, and a first resistor and a second resistor connected in series; The adjustable resistor, the first capacitor, the second capacitor, the rectifier bridge, and the first resistor and the second resistor connected in series are connected in parallel with a power supply, the first end of the first inductor is electrically connected to the first end of the adjustable resistor, the third end of the first inductor is electrically connected to the first end of the first resistor, the second end of the first inductor is electrically connected to the second end of the adjustable resistor, and the fourth end of the first inductor is electrically connected to the second end of the second resistor; the first end of the second inductor is electrically connected to the first end of the first capacitor, the second end of the second inductor is electrically connected to the second end of the first capacitor, the third end of the second inductor is electrically connected to the first end of the second capacitor, and the fourth end of the second inductor is electrically connected to the second end of the second capacitor.

10. A charger, characterized in that: The invention comprises the electrolytic capacitor stored electricity release circuit as described in any one of claims 1 to 9.

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